2 * env.c -- small service routines
4 * Copyright 1998 by Eric S. Raymond
5 * For license terms, see the file COPYING in this directory.
11 #if defined(STDC_HEADERS)
14 #if defined(HAVE_UNISTD_H)
19 #ifdef HAVE_NET_SOCKET_H
20 #include <net/socket.h>
22 #ifdef HAVE_GETHOSTBYNAME
24 #endif /* HAVE_GETHOSTBYNAME */
25 #include <sys/types.h>
27 #include "fetchmail.h"
30 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
35 extern char *getenv(); /* needed on sysV68 R3V7.1. */
37 extern char *program_name;
39 void envquery(int argc, char **argv)
40 /* set up basic stuff from the environment (including the rc file name) */
42 struct passwd by_name, by_uid, *pwp;
44 (user = getenv("FETCHMAILUSER"))
45 || (user = getenv("LOGNAME"))
46 || (user = getenv("USER"));
48 if (!(pwp = getpwuid(getuid())))
51 _("%s: You don't exist. Go away.\n"),
57 memcpy(&by_uid, pwp, sizeof(struct passwd));
58 if (!user || !(pwp = getpwnam(user)))
63 * This logic is needed to handle gracefully the possibility
64 * that multiple names might be mapped to one UID.
66 memcpy(&by_name, pwp, sizeof(struct passwd));
68 if (by_name.pw_uid == by_uid.pw_uid)
73 user = xstrdup(pwp->pw_name);
76 /* compute user's home directory */
77 if (!(home = getenv("HOME")))
80 /* compute fetchmail's home directory */
81 if (!(fmhome = getenv("FETCHMAILHOME")))
84 if ((program_name = strrchr(argv[0], '/')) != NULL)
87 program_name = argv[0];
89 #define RCFILE_NAME "fetchmailrc"
91 * The (fmhome==home) leaves an extra character for a . at the
92 * beginning of the rc file's name, iff fetchmail is using $HOME
93 * for its files. We don't want to do that if fetchmail has its
94 * own home ($FETCHMAILHOME), however.
96 rcfile = (char *)xmalloc(strlen(fmhome)+sizeof(RCFILE_NAME)+(fmhome==home)+2);
97 /* avoid //.fetchmailrc */
98 if (strcmp(fmhome, "/") != 0)
99 strcpy(rcfile, fmhome);
103 if (rcfile[strlen(rcfile) - 1] != '/')
107 strcat(rcfile, RCFILE_NAME);
110 char *host_fqdn(void)
111 /* get the FQDN of the machine we're running */
113 char tmpbuf[HOSTLEN+1];
115 if (gethostname(tmpbuf, sizeof(tmpbuf)))
117 fprintf(stderr, _("%s: can't determine your host!"),
121 #ifdef HAVE_GETHOSTBYNAME
122 /* if we got a . in the hostname assume it is a FQDN */
123 if (strchr(tmpbuf, '.') == NULL)
127 /* if we got a basename (as we do in Linux) make a FQDN of it */
128 hp = gethostbyname(tmpbuf);
129 if (hp == (struct hostent *) NULL)
131 /* exit with error message */
133 _("gethostbyname failed for %s\n"), tmpbuf);
136 return(xstrdup(hp->h_name));
139 #endif /* HAVE_GETHOSTBYNAME */
140 return(xstrdup(tmpbuf));
143 static char *tzoffset(time_t *now)
144 /* calculate timezone offset */
146 static char offset_string[6];
153 off = (lt->tm_hour - gmt.tm_hour) * 60 + lt->tm_min - gmt.tm_min;
154 if (lt->tm_year < gmt.tm_year)
156 else if (lt->tm_year > gmt.tm_year)
158 else if (lt->tm_yday < gmt.tm_yday)
160 else if (lt->tm_yday > gmt.tm_yday)
166 if (off >= 24 * 60) /* should be impossible */
167 off = 23 * 60 + 59; /* if not, insert silly value */
168 sprintf(offset_string, "%c%02d%02d", sign, off / 60, off % 60);
169 return (offset_string);
172 char *rfc822timestamp(void)
173 /* return a timestamp in RFC822 form */
181 * Conform to RFC822. We generate a 4-digit year here, avoiding
182 * Y2K hassles. Max length of this timestamp in an English locale
183 * should be 29 chars. The only things that should vary by locale
184 * are the day and month abbreviations. The set_locale calls prevent
185 * weird multibyte i18n characters (such as kanji) for showing up
186 * in your Received headers.
188 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
189 setlocale (LC_TIME, "C");
191 strftime(buf, sizeof(buf)-1,
192 "%a, %d %b %Y %H:%M:%S XXXXX (%Z)", localtime(&now));
193 #if defined(HAVE_SETLOCALE) && defined(ENABLE_NLS) && defined(HAVE_STRFTIME)
194 setlocale (LC_TIME, "");
196 strncpy(strstr(buf, "XXXXX"), tzoffset(&now), 5);
199 * This is really just a portability fallback, as the
200 * date format ctime(3) emits is not RFC822
203 strcpy(buf, ctime(&now));
204 buf[strlen(buf)-1] = '\0'; /* remove trailing \n */
205 #endif /* HAVE_STRFTIME */
210 const char *showproto(int proto)
211 /* protocol index to protocol name mapping */
215 case P_AUTO: return("auto");
217 case P_POP2: return("POP2");
218 #endif /* POP2_ENABLE */
220 case P_POP3: return("POP3");
221 case P_APOP: return("APOP");
222 case P_RPOP: return("RPOP");
223 #endif /* POP3_ENABLE */
225 case P_IMAP: return("IMAP");
226 #endif /* IMAP_ENABLE */
228 case P_ETRN: return("ETRN");
229 #endif /* ETRN_ENABLE */
231 case P_ODMR: return("ODMR");
232 #endif /* ODMR_ENABLE */
233 default: return("unknown?!?");
237 char *visbuf(const char *buf)
238 /* visibilize a given string */
240 static char vbuf[BUFSIZ];
247 *tp++ = '\\'; *tp++ = '"';
250 else if (*buf == '\\')
252 *tp++ = '\\'; *tp++ = '\\';
255 else if (isprint(*buf) || *buf == ' ')
257 else if (*buf == '\n')
259 *tp++ = '\\'; *tp++ = 'n';
262 else if (*buf == '\r')
264 *tp++ = '\\'; *tp++ = 'r';
267 else if (*buf == '\b')
269 *tp++ = '\\'; *tp++ = 'b';
274 *tp++ = '\\'; *tp++ = '^'; *tp++ = '@' + *buf;
279 (void) sprintf(tp, "\\0x%02x", *buf++);
287 /* env.c ends here */